Do you want to say that this script will help instead "emerge rsync" ?

Yes... from the Gentoo-FAQ:

Quote:

If you're behind a firewall that doesn't permit rsync traffic, then you can instead download the daily /usr/portage snapshot from http://cvs.gentoo.org/snapshots. Just unpack the tarball (using tar xvjf portage-foo.tbz2) in the /usr directory.

I only followed the instructions
But my script is a little bit more powerful than the manual wget way *g*